Understanding Android's <layer-list>

Solution 1:

The values for left, top, right and bottom are measured from their respective edge.

So left=0dp, top=0dp, bottom=0dp & right=50dp will give you a rectangle that is (match_parent - 50dp) wide and not 50dp wide. Therefore larger values for "right" will actually give you a smaller rectangle.

The same would apply to the other value, but these would behave as expected in most cases, its just "right" that might cause confusion.

Solution 2:

Either you use px instead of dp or multiply all dimensions by 10.

I'm ashamed to admit that I don't exactly know WHY this is happening but my guess is that it has something to do with densities where 1dp is a floating px value and the ImageView is scaled up.

Expert answer is welcomed :)